Category Archives: TAPR VNA

Crystal filter analysis, SW40

I’ve been away from the blog for quite awhile, mainly because I ran into several roadblocks which stymied my progress with the SW40 build and analysis. I really wanted to re-visit the type of analysis I did when I built … Continue reading

Posted in crystal characterization, crystal filter, SW-40, TAPR VNA, Wes Hayward | Leave a comment

Manhattanizing the Mrad-40

I’m almost done with my little Mrad-40 rig.  I didn’t get to work on soldering it into the box as much as I wanted to this weekend but tonight I almost finished it.  The troubles I’m having now are mostly … Continue reading

Posted in manhattan style, Mrad-40, QRPMe, TAPR VNA, transformers, VNA | Leave a comment

Test drive; pi network sim + measurement

What a fun night! I decided to hook up the existing NE602/LM386 circuitry as a “test drive” of my VFO (the circuitry that was in the old version of the MRad-40, on 2 pieces of perfboard).  It worked!  Although with … Continue reading

Posted in Mrad-40, pi network, Puff, TAPR VNA | Leave a comment